<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 步骤条区域 -->
      <el-steps :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        ref="addFormRef"
        :model="addForm"
        label-width="100px"
        :rules="addFormRules"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <!-- el-form-item的prop绑定的是校验规则对象中的属性名 -->
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                :options="catelist"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              :key="item.attr_id"
              v-for="item in manyTableData"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台api地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
              name="file"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor
              v-model="addForm.goods_introduce"
            ></quill-editor>
            <el-button class="btnAdd" @click="add" type="primary"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="图片开小差" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
//导入依赖
import _ from 'loadsh'

export default {
  data() {
    //验证价格和数量的规则
    var check = (rule, value, cb) => {
      //验证邮箱的正则表达式
      const reg = /[1-9]+/

      if (reg.test(value)) {
        //合法的手机号,不传入错误信息
        return cb()
      }
      //调用回调函数cb,传入错误信息
      cb(new Error('内容不能为0'))
    }
    return {
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //图片数组
        pics: [],
        //商品详情描述
        goods_introduce: '',
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
          { validator: check, trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
          { validator: check, trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品的分类', trigger: 'blur' },
        ],
      },
      catelist: [],
      //指定级联展示的属性
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover',
      },
      //动态参数列表数据
      manyTableData: [],
      onlyTableData: [],
      uploadURL:
        window.location.protocol + '//127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
        //添加前端发送图片到后端的跨域请求头
        'Access-Control-Allow-Origin': '*',
      },
      previewPath: '',
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类的数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }
      this.catelist = res.data
    },
    //级联选中项变化,会触发这个函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    //切换标签页,进入标签页之前调用的函数
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品的分类!')
        return false
      }
    },
    //tab点击事件切换tab后会触发
    async tabClicked() {
      //访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } }
        )
        if (res.meta.status !== 200) {
          this.$message.error('获取参数列表失败!')
        }
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        //console.log(this.manyTableData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } }
        )
        if (res.meta.status !== 200) {
          this.$message.error('获取参数列表失败!')
        }

        this.onlyTableData = res.data
      }
    },
    //处理图片预览
    handlePreview(file) {
      //获取图片临时的url路径,并保存
      this.previewPath = file.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      //file是将要被移除的图片
      const filePath = file.response.data.tmp_path
      const index = this.addForm.pics.findIndex((item) => {
        return item.pic === filePath
      })
      this.addForm.pics.splice(index, 1)
      //console.log(this.addForm)
    },
    //监听图片上传成功函数
    handleSuccess(rep) {
      //拼接得到一个图片信息对象,然后push到pics中
      const picInfo = {
        pic: rep.data.tmp_path,
      }
      this.addForm.pics.push(picInfo)
      //console.log(this.addForm)
    },
    //添加商品
    add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return this.$message.error('请填写必要的表单项!')
        //执行添加的业务逻辑
        //修改对应的传参

        //this.addForm.goods_cat=this.addForm.goods_cat.join(',')
        //此方法会导致级联选择框报错,因此使用深拷贝复制原对象,再对拷贝后的对象进行处理
        //深拷贝 安装运行依赖loadsh   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            //传入字符串
            attr_value: item.attr_vals.join(','),
          }
          this.addForm.attrs.push(newInfo)
        })

        //静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            //传入字符串,静态属性本就字符串
            attr_value: item.attr_vals,
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        //发起请求添加商品
        //商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!商品名称已经存在')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
